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9 Component Description and Selected Design Issues 9.1 Introduction This chapter describes the major plant components: the recuperators, pre-cooler, compressors and turbine. The details of the heat exchanger thermal and hydraulic design were described in Chapter 3. However, since the HEATRIC PCHE is a relatively new piece of technology they deserve more thorough description and discussion. The majority of the information presented here is a summary of the HEATRIC workshop at MIT. Some other issues for the PCHEs such as the effect of the conduction length and wavy channels on the heat exchanger performance are presented here as well. The turbomachinery design was performed using the code AXIALTM provided by CONCEPTS/NREC. The section on turbomachinery summarizes the design developed by Yong Wang using this code. 9.2 Heat Exchangers Heat exchangers are by far the largest cycle components. One of the main goals is to keep the cycle compact. Therefore it is necessary to survey current heat exchanger technology and select a heat exchanger type that is compact and has a small pressure drop. Classical shell and tube heat exchangers are not suitable. In order to achieve a high degree of compactness the tube diameters would have to be very small. This would introduce difficulties in manufacturing. Furthermore, the pressure differential in the recuperator is large, so the tube wall would have to be thick to withstand the difference between the high and low cycle pressures. Due to these reasons shell and tube heat exchangers were not investigated further. The main focus was on compact heat exchangers, which have been used for several decades with satisfactory operating experience. They were developed mainly for gas applications since gases in general have poor heat transfer capabilities. In order to improve the heat transfer, extended surfaces are used. Compact heat exchangers can be 201PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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